MVCC

This article covers transaction isolation in TokuDB. The source implementation is complex; for clarity, we focus on the most essential parts and omit minor details. Background In traditional relational databases (Oracle, MySQL, SQL Server, and others), transactions are central to both engineering and discussion. The core properties of a transaction are ACID. A (atomicity) means a transaction’s sub-operations have only two outcomes: all succeed on commit, or all are undone on rollback....